provide an alias for/have as aliases be defined by/define provide an alias for/have as aliases provide an alias for/have as aliases provide an alias for/have as aliases be defined by/defined be defined by/defined be defined by/define be a kind of/void provide an alias for/have as aliases be defined by/define activity class activity class alias classification system equipment class equipment class alias facility class facility class alias material class material class alias ref classification system well log trace class well log trace class alias